Rare Isotope Formation in Complete Fusion and Multinucleon Transfer Reactions in Collisions of 48Ca +248Cm around Coulomb Barrier Energies

Abstract

Within the framework of dinuclear system model, the reaction mechanisms for synthesizing targetlike isotopes from Bk to compound nuclei Lv are thoroughly investigated in complete and incomplete fusion reaction of 48 Ca + 248 Cm around Coulomb barrier energies. Production cross section of 292,293 Lv as a function of excitation energy in fusion-evaporation reactions and target-like isotopic yields in multinucleon transfer reactions are evaluated, in which a statistical approach is used to describe the decay process of excited nuclei. The available experimental data can be reproduced well with the model reasonably. The products of all possible formed isotopes in the dynamical preequilibrium process for collision partners at incident energy E lab = 5.5 MeV/nucleon are exported, systematically. It is found that the quasi-fission fragments are dominant in the yields. The optimal pathway from target to compound nuclei shows up along the valley of potential surface energy. The effective impact parameter of two colliding partners leading to compound nuclei is selected from head on collison to semicentral collision with L = 52 h. The timescale boundary between complete fusion and multinucleon transfer reactions is about 5.7×10 −21 s with effective impact parameters. Synthesis cross section of unknown neutron-rich actinides from Bk to Rf have been predicted around several nanobarn.